Bulk Capitalize Display Names?

On my site (itinerantangler.com) I have a longstanding Real Names Policy. As a result almost all of my users have their actual first and last names displayed as their Display Names.

If I go into an individual user’s profile I can edit the ‘Display Name’ by hitting a drop down box. This gives a bunch of options; lower case, last-name-first, etc. The one I would like for everyone to use is the regular old ‘First Last’ setting with capitals for their first and last names.

Unfortunately the board software defaulted to lower case ‘first last’ when I transferred in from some other software.

Is there a way to bulk change all my users’ drop-down boxes to the ‘First Last’ setting as a default?